|Reference : Early colonization of Posidonia oceanica (L.) Delile by epiphytes: Comparison between na...|
|Scientific congresses and symposiums : Paper published in a book|
|Life sciences : Environmental sciences & ecology|
Life sciences : Aquatic sciences & oceanology
|Early colonization of Posidonia oceanica (L.) Delile by epiphytes: Comparison between natural and artificial seagrass leaves|
|[fr] Colonisation épiphyte précoce de Posidonia oceanica (L.) Delile: Comparaison entre feuilles naturelles et artificielles.|
|Pete, Dorothée [Université de Liège - ULg > Département des sciences et gestion de l'environnement > Océanologie >]|
|Gobert, Sylvie [Université de Liège - ULg > Département des sciences et gestion de l'environnement > Océanologie >]|
|Lepoint, Gilles [Université de Liège - ULg > Département des sciences et gestion de l'environnement > Océanologie >]|
|Poulicek, Mathieu [Université de Liège - ULg > Département des sciences et gestion de l'environnement > Ecologie animale et écotoxicologie >]|
|Bouquegneau, Jean-Marie [Université de Liège - ULg > Département des sciences et gestion de l'environnement > Océanologie >]|
|Proceedings of the third Mediterranean symposium on marine vegetation|
|El Asmi, Souha|
|Le Ravallec, Célia|
|Third Mediterranean symposium on marine vegetation|
|du 27 au 29 mars 2007|
|United Nation Environment Programme|
|Mediterranean Action Plan|
|Regional Activity Centre for Specially Protected Areas|
|[en] epiphytes ; seagrass ; colonization|
|[en] Posidonia oceanica is an important marine Magnoliophyta of the Mediterranean coastal zone that can form dense meadows. The leaves of this seagrass are colonized by a lot of organisms, from bacteria to polychaetes and algae. However, the early stages of colonization are not well known.
A preliminary is proposed to examine the nine first days of colonization by epiphytes on natural leaves and on Artificial Seagrass Units (ASUs). Aims of this work were to understand which species are the first to set up, to compare colonization on both leaves and to determine the interest of ASUs in ecological studies.
It was shown that the setting up of epiphytes on the bases of both leaves is rapid (first algae on the second day) but the number of organisms increases quicker on ASUs than on natural leaves and on the smooth faces than the rough ones. Shannon-Wiener diversity and evenness were higher for the P. oceanica leaves and the use of Bray-Curtis similarity index showed that colonisation is not similar (between 20 and 30 % similarity) on both leaves for the same day. It can be explained by the lower colonization rate of natural leaves. This lower rate is probably due to a less developed biofilm on natural leaves than on ASUs, to a difficult access to the bases of P. oceanica leaves for epiphytes and microoganisms, and the production of phenol compounds by the plant. Even if ASUs used here do not seem to be similar to natural leaves in early stages of colonization, they could be used in ecological studies thanks to their rapid covering by epiphytes.
|Fonds de la Recherche Fondamentale Collective d'Initiative des Chercheurs - FRFC ; Fonds de la Recherche Scientifique (Communauté française de Belgique) - F.R.S.-FNRS ; Fondation de Recherches Sous-marines et Océanographiques|
|Researchers ; Professionals ; Students|
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